URIteacherknowledge - Electron Transport AD 08

Rhode Island Department of Education
Lesson Plan
andrew d

Lesson Title:Electron Transport

State Standards: GLEs/GSEs

LS 1- all living organisms have identifiable structures and characteristics that allow for survival(organisms, populations, and species)
1a
explaining the relationships between and amongst the specialized structures of the cell and their functions (e.g. transport of materials, energy transfer, protein building, waste disposal, information feedback, and even movement).
1b
explaining that most multicellular organisms have specialized cells to survive, while unicellular organisms perform all survival functions. (e.g. nerve cells communicate with other cells, muscle cells contract, unicellular are not specialized). Students demonstrate understanding of differentiation by…

National Standards:

Context of Lesson:

The next lesson in my sequence deals with electron transport, a big part being the steps that take place when light reactions take place in the thylakoid membrane. Another major point will be describing how electrons play a roll in these processes. This fits into the lesson because it takes the thylakoid that they learned about last class and shows some of what it does more closely. Students will also be given their project handout so they can begin to make plans and see who their partner is. This lesson is important if not for the lesson, but the beginning of the Photosynthesis project.
Overview of lesson, including: where it fits in unit, what are key ideas and what will students be doing.

Opportunities to Learn:

Depth of Knowledge

Webb's DOK- Level 1 Recall and Reproduction
An important topic learned in this section deals with the need for electrons in Photosynthesis and the idea that if electrons from photosystem 2 aren't replaced then both electron transport chains would stop which would stop photosynthesis. Students will also be introduced to the beginning information of the importantce of oxygen.

Prerequisite Knowledge

Learned in chapter 2 that each oxidation reaction must be accompanied by a reduction reaction
Information about thylakoid from previous class

Plans for Differentiating Instruction

I will differentiate instruction by clearly labeling the steps involved in the light reaction that take place in the thylakoid memebrane. I think that students will have a better chance of understanding if the steps are clearly written out and accompany a picture of the process either on an over head or if need be visible on a hand out passed out at the beginning of class.

Accommodations and modifications

Environmental factors

Materials

Over heads
Dry erase board
Markers
Photosynthesis Project handout

Objectives:

Go over homework
Students should come away with knowledge about photosystems 1 and 2
As a class we will go through the steps that follow photosystems 1 and 2
Restoring Photosystem 2
Assign groups for the photosynthesis project

Instruction:

Opening:

Today i want to go over the homework but while I take attendance and go over the homework I want students to write about what they learned from the homework.
- HW #1- Describe the structure and function of the Thylakoids of a chloroplast.
  - A thylakoid is a flattened membranous sac inside chloroplast and contains most of the components involved in the light reactions of photosynthesis. when thylakoids are layered on top of each other they are called grana and the thyaloids are surrounded by a solution called stroma.
- HW #2-What role do accessory pigments play in Photosynthesis
  - Accessory pigments absorb the light energy and then transfer energy to chlorophyll a in photosynthesis. So the accessory pigments job is to absorb and transfer energy.
After the opening question and discussion we will go over the homework because I want to make sure that the kids understand the homework, and it will give me a chance to ask some review questions from the previous class.
- What is a Grana
- What is a Stroma
- What are some accessory pigments
- To produce glucose and O2 what do we need (CO2, H2O, and light energy)
- When are carotenoids able to show through? Why?
After we have gone through the home work we will begin talking about Electron Transport.

Engagement:

The class will be learning about photo systems 1 and 2.
- Photosystem 1 and 2- each cliuster of pigment molecules
  - similar in terms of kinds of pigments they contain, but have different roles in the light reactions
light reactions take place in several steps in the thylakoid membrane
- step 1: Light energy forces electrons to enter a higher energy level in the two chlorophyll a molecules of photosystem 2. the energized electrons are said to be " excited"
- step 2: The excited electrons have enough energy to leave the chlorophyll a molecules. Electrons have been lost which means the chlorophyll a molecules have gone through an oxidation reaction-Loss of electron( vs. a redox reaction which gains electrons) Since each oxidation reaction must be accompanied by a redox reaction to accept the electron. That substance is a molecule inside the thyllakoid membrane which is known as a primary acceptor.
- step 3: The primary electron acceptor then donates the electrons to the first of a series of molecules located in the thyllakoid membrane. this series of molecules is known as an electron transport chain.(transfers electrons from molecules to the next in series. As the electrons pass from molecule to molecule they lose most of the energy they gained when they were excited. This lost energy is used to move protons into the thyllakoid.
- step 4: Photosystems 1 and 2 absorb light at the same time. Electrons move from a pair of chllorophyll a molecules in photosystem 1 to another primary electron acceptor. the electrons lost by these chllorophyll a molecules are replaced by electrons that have passe through the electron transport chain from photosystem 2.
- step 5: The primary electron acceptor of photosystem 1 donates electrons to a different electron transport chain. this chain brings the electrons to the side of the thyllakoid membrane that faces the stroma. there the electrons combine with a proton and NADP. NADP is an organic molecule that accepts electrons during redox reactions which reduces NADP to NADPH.
If we get through these steps we will visit Restoring Photosystem 2

Closure:

To end the class I will be going over the Photosynthesis project, giving out rubrics, and getting the groups together.
If time permits I will allow the groups to discuss some ideas they may have for their games.
The final item on my agenda is assigning the nights homework. I will let the students know that it is a good idea to keep their homework and add to it as we go over it in class because it can be a good way to study and for the Photosynthesis project.

Electron Transport AD 08